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1989 Oldsmobile 88 engine running rough

Tiny
DAN53
  • MEMBER
  • 1989 OLDSMOBILE 88
  • 3.8L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 200,000 MILES
When the outside air temp is 60 degrees or lower the engines runs good no problem. 65 degrees and up car starts running rough after a few minutes runs rough all speeds. Check engine light does not come on. Shut car off for 10 minutes start runs good for awhile than starts running rough again. The warmer the outside temp is the quicker it starts running rough. Stumped dan please help thank you
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Monday, May 12th, 2014 AT 10:22 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Has the temp sensor ever been replaced? When it starts running bad, have you ever noticed any black smoke from the exhaust or a rich smell from the exhaust?
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Monday, May 12th, 2014 AT 10:41 AM
Tiny
DAN53
  • MEMBER
  • 3 POSTS
Temp sensor has never been changed. No I haven't noticed anything with the exhaust.
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Monday, May 12th, 2014 AT 10:46 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
I need you to scan the computer, even though the check engine light isn't on. Do you know how?
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Monday, May 12th, 2014 AT 5:51 PM
Tiny
DAN53
  • MEMBER
  • 3 POSTS
Scan the codes by the ignition switch, counting service engine light when it flashes the codes
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Tuesday, May 13th, 2014 AT 5:01 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
There should be a port that where you jump the A and B terminals to get the codes.
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Tuesday, May 13th, 2014 AT 8:52 AM

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